PT - JOURNAL ARTICLE AU - Akie Nakamura AU - Koji Muroya AU - Hiroko Ogata-Kawata AU - Kazuhiko Nakabayashi AU - Keiko Matsubara AU - Tsutomu Ogata AU - Kenji Kurosawa AU - Maki Fukami AU - Masayo Kagami TI - A case of paternal uniparental isodisomy for chromosome 7 associated with overgrowth AID - 10.1136/jmedgenet-2017-104986 DP - 2018 Feb 17 TA - Journal of Medical Genetics PG - jmedgenet-2017-104986 4099 - http://jmg.bmj.com/content/early/2018/02/17/jmedgenet-2017-104986.short 4100 - http://jmg.bmj.com/content/early/2018/02/17/jmedgenet-2017-104986.full AB - Background Paternal uniparental disomy for chromosome 7 (upd(7)pat) is extremely rare, and only four cases have been previously reported. As these cases were accompanied by autosomal-recessive disorders which are likely to be involved in growth restriction, the relevance of upd(7)pat to the overgrowth phenotype remains unclear. Here we describe one case of upd(7)pat with no additional genetic diseases, which may answer the question.Methods A 5-year-old Japanese boy presented with a tall stature of unknown causes. To detect the genetic cause of the tall stature, we performed Sanger sequencing, targeted resequencing, comparative genomic hybridisation and single-nucleotide polymorphism (SNP) array analyses, methylation analysis and microsatellite analysis.Results We could not detect pathogenic variants in causative genes for overgrowth syndrome or apparent copy number alterations. DNA methylation analysis revealed hypomethylation at the GRB10, PEG1 and PEG10 differentially methylated regions. SNP array and microsatellite analyses suggested paternal uniparental isodisomy for chromosome 7. Furthermore, we could not identify homozygous mutations of known causative genes for inherited disorders on chromosome 7.Conclusion We report the first case of upd(7)pat with an overgrowth phenotype.